This immediately put me out because I couldn’t tuck my leg under myself as I’m want to do in office chairs. But it did force me to sit up straight and properly. Huh… Maybe an office chair ...

Sit slightly forward in a chair so that the back is not in contact with the back support. Sit up straight. Employ abdominal bracing. Slowly march and alternate lifting each knee a few inches.

Chair exercises are an effective way to target ... Hold for 30 seconds to 1 minute. Repeat 2–3 times. Sit up straight and place one hand behind your head. Extend the other arm overhead and ...